In this paper, we briefly summarize the consequences of the Mott-Kondo
scenario based on the extended \(t\) -\(J\) -\(K\)  model for nickelate
superconductors [1]}, [2]}. We propose a global phase
diagram upon electron and hole doping and derive a low-energy effective
Hamiltonian with doublon and holon excitations in the low doping region. We
then employ the renormalized mean-field theory (RMFT) to study the
possibility of superconductivity and predict a phase transition of its
pairing symmetry. The latter is shown to originate from the breakdown of
Kondo hybridization, accompanied with non-Fermi liquid (NFL) behavior of the
resistivity \(\rho \sim T^\alpha \)  near critical doping.
